RD1 or 0140+326 RD1 is a distant galaxy, it once held the title of most distant galaxy known.[3] RD1 was discovered in March 1998, and is at z = 5.34,[1] and was the first object found to exceed redshift 5.[4] It bested the previous recordholders, a pair of galaxies at z=4.92 lensed by the galaxy cluster CL 1358+62 (CL 1358+62 G1 & CL 1358+62 G2). It was the most distant object known to mankind for a few months in 1998, until BR1202-0725 LAE was discovered at z = 5.64.
Distance measurements
The "distance" of a far away galaxy depends on the chosen distance measurement. With a redshift of 5.34,[1] light from this galaxy is estimated to have taken around 12.5 billion years to reach us.[2] But since this galaxy is receding from Earth, the present comoving distance is estimated to be around 26 billion light-years.[2]
References
- ^ a b c arXiv, Dey, Arjun; Spinrad, Hyron; Stern, Daniel; Graham, James R.; Chaffee, Frederic H. (1998). "A Galaxy at z = 5.34". The Astrophysical Journal. 498 (2): L93–L97. arXiv:astro-ph/9803137. Bibcode:1998ApJ...498L..93D. doi:10.1086/311331. (209 KB), 11 March 1998
- ^ a b c d Edward L. (Ned) Wright. "Cosmology Calculator I". Astronomy @ UCLA. Archived from the original on 2018-09-29. Retrieved 2010-10-22.
- ^ Astronomy Picture of the Day, A Baby Galaxy Archived 2011-05-19 at the Wayback Machine, March 24, 1998
- ^ New York Times, Peering Back in Time, Astronomers Glimpse Galaxies Aborning Archived 2022-08-15 at the Wayback Machine, October 20, 1998
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